Programmer Think

One preparation First create the folder with the following structure: weim@weim:~/myopt$ ls ubuntu1 ubuntu2 ubuntu3 And extract the downloaded JDK (version: 8u172), Hadoop (version: hadoop-2.9.1) into three folders, as follows: weim@weim:~/myopt$ ls ubuntu1 hadoop jdk weim@weim:~/myopt$ ls ubuntu2 hadoop jdk weim@weim:~/myopt$ ls ubuntu ...

For reprint, please indicate the source: http://www.cnblogs.com/qm-article/p/8903893.html I. Introduction Before introducing the source code, let's first learn about the linked list. Everyone who has touched the data structure knows that there is a kind of structure called linked list. Of course, there are many kinds of linked list, such as the ...

Lesson Eight　　　　　　　　　　　　　　　　　　　　　　　　　　　　2018-04-23　　02:07:01 Encapsulation and Hiding:Problem: When an object of a class is created, it may come as an unexpected failure to satisfy the actual situation if the corresponding object property is assigned directly through the way of Object.Attribute. Lead out: Control ...

ODL is based on MDSL, whose model is defined in YAGN language, and the class generated by Yang-tool is used in programming. The data stored in ODL's DataStore needs to be serialized and deserialized. The serialized deserialized code is generated dynamically through Javassist. BindingToNormalizedNodecodec.java public <T ...

(Source version JDK 8) Collection classes can be grouped into three types in a java.util package: Set, List, Map. JAVA Collection Relationships (sketch) (Picture Source Network) Both List and Set collections inherit the Collection interface and are the top-level interfaces for List and Set, including the following methods: List Collection A L ...

01. Disadvantages of unrestricted threads Multithread software design method can really maximize the computing power of multi-core processors and improve the throughput and performance of production systems. However, if threads are used arbitrarily without control and management, the performance of the system will be adverse ...

This article only introduces the key parts of ThreadPool Executor source code. At the beginning, we introduce some core constants in ThreadPool Executor, and then select several key methods in the thread pool work cycle to analyze its source code implementation. In fact, the best way to see the JDK source code is to look at class f ...

Deep Understanding of ThreadLocal purpose We usually use ThreadLocal to provide thread local variables. Thread local variables have a copy within each Thread, and Thread can only access its own copy. Text interpretation is always obscure. Let's take an example. public class Test { private static ThreadLocal<String> threa ...

Preface Only a bald head can be stronger. The text has been included in my GitHub warehouse. Welcome to Star: https://github.com/ZhongFuCheng3y/3y In the last article, a reader said that one minute will be the end of the facade model, so today's title is "One minute Learn Template Method Model". Looking back on the design patterns t ...

We know that if you want to put beans in the spring container management, you need to register beans in the spring container first, and beans can be registered by xml or annotations. The configuration based on xml is usually configurated by xml tags such as < bean >, < context: component-scan >, and then the spring con ...